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• W4295958271 endingPage "167235" @default.
• W4295958271 startingPage "167235" @default.
• W4295958271 abstract "The heat loss in the process of casting Mn metal and the generation of Mn powder in the process of breaking Mn ingots have always been difficult problems in the industry. In order to realize the energy saving and loss reduction in the process of casting manganese metal, we propose a concept of near-net-shape casting of Mn metal based on Grain Refinement Principle, in which the Mn metal melt is cast to small product size and heat recovery is realized through water heat transfer. The challenge of this method is to control solidification structure and improve mechanical properties using small-size casting mould. Present work focuses on the study of the solidification microstructure evolution mechanism of Mn metal and its structure-activity relationship with mechanical properties of small size abrasives casting process. The results showed that the average grain size of Mn metal first decreases and then increases as the decrease in casting temperature. The average grain size is the smallest when the casting temperature is 1533 K. The grain size of Mn metal is mainly affected by its critical nucleation radius. The relationship between the critical nucleation radius of Mn metal and its average grain size is established thatr=69.15∙exp−exp0.05r*−37.16;R2=0.9460. The smaller the critical nucleation size is, the more dendrite fragments there are to achieve grain refinement. The hall Petch relationship between the average grain size and the comprehensive strength of Mn metal under different casting conditions is established thatσ=1755.34d−1/2−137.27,R2=0.93457, the average size of the formula is 50–70 µm Mn metal has good applicability. The mechanical properties of the single β-Mn crystalline form are significantly better than those of the mixed α + β crystalline form with a casting temperature below 1573 K. The influence of solidification structure on the mechanical properties of Mn metal is much more significant than that of crystal form. This primary molding technology is also applicable to the casting process of metals with high intrinsic brittleness, such as silicon, germanium, and titanium, so it has a broad application prospect." @default.
• W4295958271 created "2022-09-16" @default.
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• W4295958271 date "2022-12-01" @default.
• W4295958271 modified "2023-10-17" @default.
• W4295958271 title "Innovation near-net-shape casting process of manganese metal based on grain refinement principle" @default.
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• W4295958271 doi "https://doi.org/10.1016/j.jallcom.2022.167235" @default.
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